PDF malware analysis — malicious · f5841dbe4a89af7c

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 22:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a02a2e39997ac2c7f63eec5bf952cca2 SHA-1: 6844eff695e96a506be856e8402c1f45b734b5c4 SHA-256: f5841dbe4a89af7c5b51315307c2567a78c5cdcd007bfb22813c59c0bf5eb51c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a759aa3bdf6---8457478238.pdf In PDF document text
- https://client-sms.com/ckfinder/userfiles/files/jataj.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c621bcbab0---66296473616.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d507bf9a2b7---rutasawelerisubowo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc34462f7---futifujozudazagufalujizib.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991cd865586---romibilapujowinadum.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/q8eh0vhphdtavcc8j8nk2jevl4/64350360539.pdfIn PDF document text
- https://topupdana.com/contents//files/71434543088.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6b7dd4e6---65571844012.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da89965b6---8260400366.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/cf6d3ac518889c2ccea7736198a16bfa/68020767973.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acbade6fb---letokefulepumot.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8b54d0990b1248f41bb16ce267e7706e/81415754077.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bda6b6c7---35551023287.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d053ee1434---kufebetikibo.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1eacd1a3b---nefafaloz.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cea4cbcfd5cc79435a47079b1db1ab6c/zunumabegixupudunagax.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3a33ed6cf7d0c1b9b8b9959e539da32f/fafujilodelogotot.pdfIn PDF document text
- http://eltonltd.ru/sites/default/files/uploads/butagifuk.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3c1103f90619efcf6185ff25ea63e260/gesudemomitizidabakupokog.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1623289333.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bff01671e---nuxukikixif.pdfIn PDF document text
- http://benetalent.com/upload/files/wagakuxeregafojo.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991018216c3---21119421119.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=co+official+language+of+spainPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f020.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF020	10588 bytes
SHA-256: `f35a953342ba99cfc802d93e4c6c8f44ea873819c84370e7a5f293b0af5a6ec7`
`font_01_sfnt_off00010869.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10869	17716 bytes
SHA-256: `5b47a334993de9be7d4a2923833b6c3c4cbc97cb9563b0b6636b74bd234f5128`
`font_02_sfnt_off00013612.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13612	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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